Most slow systems are slow on boot because they're trying to load a lot into memory when they boot. In your case, you don't have much memory so another possibility is that the system is trying to load a lot of programs and it's swapping to disk frequently. Without more information, it's impossible to tell.
Download a copy of Autoruns from Microsoft
Autoruns for Windows
Autoruns will tell you what you're starting. You can uncheck things, reboot, and see if things load faster. Be careful because some things must be present at boot time.
If you wish to post back, tell us what version of Windows you're using.
Linear Mode
